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Prev Professional Automotive Repair Technical Discussions for March 22, 2007
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Open Help Requests for GM
Help Request Answers
1998 Cadillac DeVille 4.6L Radio VIN: 1G6KD54Y8X
IS there a way to unlock this radio without the code thanks Steve
1998 Cadillac Catera 3.0L no spark or fuel VIN: W06VR52R6W
This car was towed in with cranking but no start. tried spraying starting fluid but still no start. I also checked to see if the fuel pump was running but it does not. I have a Snap-on scanner but i get no communication. Checked wiring to the dlc connector but...
1987 Chevrolet V10 Suburban Scottsdale 5.7L MIL Lamp on VIN: 1GNEV16K7H
Hello all, I have a suburban that we recently put an engine in came back with a MIL light on. Code 43 sets always under heavy acceleration and the MIL stays on for the rest of the trip. Goes off when you cycle the key until the next time you do an accel with... Trouble codes: 43 (Electronic spark timing circuit.)
1987 Chevrolet Nova 1.6L No Start VIN: 1Y1SK5148H
Hello a 87 Nova/Tercel with 4A engine came into the shop with no spark. Check power to the coil OK not being grounded. Check pickup signal to the module ok. Ignitor is dead. Plugs also badly worn. Phone customer and find out that they have aready replaced two ...
1991 Chevrolet Corvette 5.7L Poor Idle Quality VIN: 1G1YY2380L
Vehicle came in with owner complaint of poor idle, and lack of power. No codes stored. Tested and found faulty TPS and MAP. Replaced same. Replaced spark plugs. Vehicle drove and idled much better, but when hot, the idle will fluctuate badly. Looks like a vacc...
1991 Chevrolet C1500 Cheyenne 4.3L Engine VIN: 2GCEC192Z0
This is more informational than asking for help. Customer brought us a chevy v-6 engine to rebuild for him. When we went to hone the block, we discovered it was cracked. We found a good core, but it was the roller cam block. We put a flat tappet cam in the mot...
1994 Chevrolet K1500 Suburban Silverado 5.7L Poor Idle Quality VIN: 1GNFK16K4R
Misses at idle, sometimes stalls, but restarts fine. Replaced iac, checked timing etc. Not a steady misfire, but a bit erratic, no pattern. Thanks in advance for your time!
1994 Chevrolet Cavalier RS 3.1L No Start VIN: 1G1JF4T5RR
this car was towed in for a no start. we found the crank sensor wires bear and rubbing together, replaced crank sensor after that repair due to no crank signal. no noid light, no spark. after following wire diagrams, found that the ignition module controls spa...
1996 Chevrolet Corsica 2.2L No Start, MIL Lamp on VIN: 1G1LD5544T
Hey guys, Its been a long time since I've need hep, so here goes. A friend has this Corsica,that won't start cold.Maybe sitting after 4-5 hours.It cranks good.The battery checks out fine. Heres the thing. If you jump the car it starts and runs fine. In all ... Trouble codes: 0125 (insufficient coolant temp for closed loop fuel control), 0171 (system to lean bank 1), 0441 (evaporative emission control system incorrect fuel flow)
1996 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEK13R7T
Hello all, We have a problem with a misfire on cyls. #3&#7 it is a dead miss.all the way up. we have scoped the ign. and found no problems. compression checks good (even on all cyls.) running compression checks good on the missing cyls. we have removed the inj...
1998 Chevrolet Blazer 4.3L heater VIN: 1GNDT17W5W
this heater system is auto temp not manual -- heater is blowing hot air then cold air.the fan motor cuts out then back on. as well the compressor is coming on/off almost at same time as fan motor is going on/off. you can hear heater blend door opening/closing....
1999 Chevrolet K1500 Suburban 5.7L p0302 VIN: 3GNFK16RXX
good customer was on trip ck eng light came on, engine died had some shop replace plugs and crank sensor. came back in town found code 0302 running ok, replaced old wires cap and rotor fuel filter, reset light came back on on highway within 2-3 weeks, running ... Trouble codes: P0302 (2 cyl missfire)
2004 Chevrolet Tahoe LS 5.3L Hydraulic Brake Booster with code B0136 VIN: 1GNEK13Z7A
Sevice "Hydraulic brake booster system" is on information center on dash. Code B0136 stored on scan tool but our Mitchell and Genysis shows "Undefined by manufacturer". What limited data on Genysis shows ok. Brakes pedal feel and braking just fine. Clear codes...
2002 GMC Sierra 2500 SL 6.0L Rear wheel speed sensor and speedometer VIN: 1GTGK29U72
This 4WD lifted truck has a problem in the ABS system. It sets a code C0238-Wheel speed mismatch-after about 2 miles of driving. The customer bought it used from a local dealer and it was already modified in its present condition. He says the ABS warning lamp ...
2000 Oldsmobile Intrigue GLS 3.5L oil consumption VIN: 1G3WX52H1Y
since valve cover replacement, car has started to use alot of oil. 5 qts in 2 weeks
1991 Pontiac Trans Sport 3.1L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 1GMCU06D2M
found fuel pressure high around 18 lbs i have a spec of 9-13 we have checked the return line and replaced the regulator in throttle body without any decrease in pressure. then tried another complete throttle body. dead headed fuel pressure is 20lbs fuel volume... Trouble codes: 45 (rich exhaust)
1996 Pontiac Grand Am GT 2.4L clutch/hydraulic VIN: 1G2NW12T5T
Car came in w/clutch pedal on floor slipping and fluid in bell housing.R and R trans and install new clutch kit w/slave cyl,sent flywheel out for resurface not real bad. Install bleed sys and found soft pedal and grind in reverse,Several attempts to bleed sys ...
1996 Pontiac Grand Am SE 3.1L No Start, Stall VIN: 1G2NE52M5T
This vehicle will intermittently not start or very hard starting issue when the engine is warm (driven within the last 1/2 hour). Cold starts are fine. I cannot duplicate the issue but she states when starting, it will run rough and die unless she keeps the rp...
2000 Pontiac Bonneville SSEi 3.8L interior carpet/trunk VIN: 1G2HZ5412Y
This is a car i just bought for my wife. When it rains the passenger floor board on the left rear and trunk will literally fill up with water. I can not find any traces of water, we smoke tested the car and found minor leaks at the window channel in the doors-...
2001 Saturn L200 2.2L stft/ltftrim;subtrac VIN: 1G8JU52F51
Hi gang,this L200 came-in running poorly,checked codes=see below,monitored long term ful trim + stftrim,found numbers around mins10% stft@idle,,[...]@ idle...When Cruising numbers got worse,,,-25-stft,,minus-22ltft.. Also was popping thru intake,so i ck'... Trouble codes: P0300, P1599, P0105

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac Catera 3.0L abs VIN: W06VR52R3W
Sorry take me little time to close out this issue. I have no relie to this matter, because no one no what are waves spring are? We went on to replace ebcm. with out replace new waves spring seem ok. but the only thing can not reset trac light and srs light wit...
1999 Cadillac Seville STS 4.6L Mechanical VIN: 1G6KY5492X
thank you for all the help guys! i did get my repair running tonight AND IT RUNS BEAUTIFUL! Here is what i learned. don't even use the dot on the intermediate shaft like the book says. it will only get you in trouble like it did me. it will take seven revoluti...
1978 Chevrolet El Camino 5.7L 2-3 shift VIN: 1W80L8Z478
thanks to everyone who replied, especially the ones that gave detail with there diagnosis. i knew very little about auto transmissions when i started this one. now i a comfortable in dissasebly and asssembly. thanks again to all of you. most were right there w...
1993 Chevrolet S10 2.8L No Start VIN: 1GCCS14R3P
thank you for all the replies. the sending unit was leaking bad, and the wires were bare. replaced sending unit and pigtail. stuck a new fuse in and away it went. again thank you guys.
1997 Chevrolet S10 LS 4.3L abs VIN: 1GCCS19X2V
Thank you all for your replies!!! They were all very helpful!!! Problem turned out to be a faulty brand new master cylinder!!! Once replaced, bled all four brakes and she works like brand new!!! Thank you all!!! You are why this site is so awesome!!! Tim
1998 Chevrolet Corvette 5.7L trans VIN: 1G1YY22G7W
Thanks to all who responded. The service column lock displayed was the problem. The local Chev dealer says this could easily have happened in the owners driveway. Part # [...] (column lock relay kit) fixed the car.
1999 Chevrolet Malibu LS 3.1L ignition switch VIN: 1G1NE52M4X
well this baby is fixed first i had the new lock from napa sent out to locksmith and they swapped the module from the old cylinder to the new cylinder but that did not cure the starting problem it did cure security problem all in all i ended up replacing t...
2000 Chevrolet Astro 4.3L No Start VIN: 1GNEL19W9Y
thanks for the suggestions and help. eddie from mich got me thinking again about the signal from vcm to ignition module. i had an ac signal from ck 423 at vcm but not at icm. i ran a jumper wire from vcm to icm and now i had a varying ac voltage at icm. still ... Trouble codes: P1351 (ignition control circuit-high voltage).
2001 Chevrolet S10 2.2L No Start, Poor Idle Quality VIN: 1GCSS14591
Ok, here's the scoop on this vehicle. I caled the owners father and he confimed that they have been using E85 for four years in it. He felt the fuel sensor may have failed and ok'd draining the tank and refilling w/ regular fuel. In addition, he mentioned ther... Trouble codes: P0621 (Gen lamp L circuit control problem).
2004 Chevrolet Silverado 2500 HD 8.1L CD player VIN: 1GCHK29G54
We first tried removing the fuse as suggested with no positive results. We then sent the truck back to the dealer to confirm that the trouble was not the programming. Turns out the CD changer has failed. Thanks for the promt responses folks.
1999 GMC C1500 Suburban 5.7L No Start VIN: 3GKEC16R8X
Thanks to everyone for the info. Soory for the delay, other tech quit and I have been run off my feet. This is fixed as it was quite the headache. The red/wht wire from the module to the sensor on the key should have 10 volts on it. When I dissassebled the col... Trouble codes: B2947 (security system sensor power circuit low).
1997 Oldsmobile Aurora 4.0L unknown VIN: 1G3GR62C2V
pressure tested vehicle cold found water pump housing leaking. Replaced water pump as a test. Inspected water pump belt found no problems. Test drove and still had to problems. Customer has driven vehicle for about a week without any problems. Thanks for all o...
2000 Oldsmobile Intrigue GL 3.5L abs module VIN: 1G3WS52HXY
Thanks again guys! I talked at length with the customer who is also retired and wanted some time to think about the repair. I installed a new EBCM after confirming powers and grounds and all is well again. I always shudder when the failure description is brief...
1994 Pontiac Grand Prix SE 3.1L No Start VIN: 1G2WJ12M2R
first i like to thank everybody that help the problem was firing order the firing order on the stiker of the car & the one in mitchell are the same but if you go one year early the firing order is diferent if you dont belive look it up something so simple can ...
1995 Pontiac Grand Am SE 3.1L No Start, Stall VIN: 1G2NE55M5S
A special thanks to all who helped me with idea's towards my crazy grand am. Unfortunatly, even though all responces did not supply me with much help, i can assure you my responded fix will be one for the books. After endless testing of wiring and sensor data,... Trouble codes: 82 (3x Signal Error).
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